Study of Variable Frequency GPR Antenna Pairing and Frequenc
发布时间：2021-04-20 00:50
地质雷达（GPR）对于地下介质的地球物理勘查来说是一种行之有效的技术,特别是对于浅层地下来说。无损、高效和数据可靠是它作为浅地表地下调查一个理想工具的重要因素。根据地下目标的类型,应用中如何选择地质雷达天线的中心频率和带宽将是一件重要的事情。实际信号的频率同分辨率、最大探测深度、地下探测物体的大小以及土壤介质的性质直接相关。因此对于每一次的勘探来说,都需要研究其天线频率的局限性。当然,既要获得高分辨的地下图像（高频）,也要有较大的探测深度（低频）一直是技术改进的目标。为了从一个新的角度研究这个问题,本论文提出了一种应用不同发射-接收频率的数据采集技术和利用频带宽度增强匹配滤波的数据处理技术。常规的采集方法中,发射-接收天线的中心频率都是相同的,而在我们的试验研究中这种情况发生了改变。为了取代通常的3对相同频率天线对观测,我们研究了50 MHz、100MHz和200MHz收-发天线不同组合的9种情况。试验场地位于中国浙江杭州良渚的莫角山。通过对其接收数据的脉冲响应的研究,我们观测到了频率互换的不同效应。实际的观测结果是:地质雷达信号的频带宽度和勘探深度主要受到发射天线频率的影响,而不是接...
【文章来源】：浙江大学浙江省 211工程院校 985工程院校 教育部直属院校
【文章页数】：111 页
【学位级别】：博士
【文章目录】：
Acknowledgement
Abstract
摘要
Chapter 1 Introduction
Overview
1.1 Background
1.2 A Brief Historical Perspective of GPR Development
1.3 Problems associated with GPR Data
1.3.1 Variable frequency antenna pairing scheme
1.3.2 Frequency Band adjustment match filtering
1.4 Objectives
1.5 Dissertation Structure
Chapter 2 Ground Penetrating Radar
Overview
2.1 Introduction
2.2 Basic Ground Penetrating Radar System
2.3 The working performance of GPR
2.4 Data Acquisition modes
2.4.1 Antenna Orientations
2.5 Advantages and Disadvantages of GPR
2.6 Basic GPR related Principles
2.6.1 Electromagnetic Properties of Material
2.6.1.1 Permittivity
2.6.1.2 Relative Permittivity
2.6.1.3 Magnetic Permeability
2.6.1.4 Electric Conductivity
2.6.2 Data Acquisition Parameters
2.6.2.1 EM Wave Propagation Velocity
2.6.2.2 Wavelength of EM Wave and Resolution
2.6.3 Relationship to Seismic Wave propagation
2.6.4 Estimation of Depth and Layer Thickness
2.6.5 Target Oriented Reflections and Identification
2.6.6 Noise and Clutter
2.7 Display of GPR Data
Chapter 3 Combinations of Variable frequency antennas and their response
Overview
3.1 Introduction
3.2 Description of Study Area
3.3 Methodology/Survey Procedure
3.4 Analysis
x-Rx frequencies antenna pairs"> 3.5 Comparison of interchangeable Tx-Rx frequencies antenna pairs
3.5.1 Pair-1 50MHz-100MHz and 100MHz-50MHz
3.5.2 Pair-2 50MHz-200MHz and 200MHz-50MHz
3.5.3 Pair-3 100MHz-200MHz and 200MHz-100MHz
3.6 Case Studies
3.7 Summary
Chapter 4 Frequency Band Adjustment based Matching Filters for GPR Data
Overview
4.1 Introduction
4.2 Data Acquisition Procedure
4.3 Theoretical Perspective
4.4 Filter fabrication Procedure
4.4.1 Constant Transmitting Frequency （CFT） FBA Match Filter
4.4.2 Similar Transmitting-Receiving Frequency （SFT） FBA Match Filter
4.4.3 Variable Transmitting Frequency （VFT） FBA Match Filter
4.5 Application results of the filters
4.5.1 CFT FBA Match Filter
4.5.2 SFT FBA Match Filter
4.5.3 VFT FBA Match Filter
Chapter 5 Conclusions and suggestions
Overview
References
Disseminations
Project Funding
Glossary
本文编号：3148646
【文章来源】：浙江大学浙江省 211工程院校 985工程院校 教育部直属院校
【文章页数】：111 页
【学位级别】：博士
【文章目录】：
Acknowledgement
Abstract
摘要
Chapter 1 Introduction
Overview
1.1 Background
1.2 A Brief Historical Perspective of GPR Development
1.3 Problems associated with GPR Data
1.3.1 Variable frequency antenna pairing scheme
1.3.2 Frequency Band adjustment match filtering
1.4 Objectives
1.5 Dissertation Structure
Chapter 2 Ground Penetrating Radar
Overview
2.1 Introduction
2.2 Basic Ground Penetrating Radar System
2.3 The working performance of GPR
2.4 Data Acquisition modes
2.4.1 Antenna Orientations
2.5 Advantages and Disadvantages of GPR
2.6 Basic GPR related Principles
2.6.1 Electromagnetic Properties of Material
2.6.1.1 Permittivity
2.6.1.2 Relative Permittivity
2.6.1.3 Magnetic Permeability
2.6.1.4 Electric Conductivity
2.6.2 Data Acquisition Parameters
2.6.2.1 EM Wave Propagation Velocity
2.6.2.2 Wavelength of EM Wave and Resolution
2.6.3 Relationship to Seismic Wave propagation
2.6.4 Estimation of Depth and Layer Thickness
2.6.5 Target Oriented Reflections and Identification
2.6.6 Noise and Clutter
2.7 Display of GPR Data
Chapter 3 Combinations of Variable frequency antennas and their response
Overview
3.1 Introduction
3.2 Description of Study Area
3.3 Methodology/Survey Procedure
3.4 Analysis
x-Rx frequencies antenna pairs"> 3.5 Comparison of interchangeable Tx-Rx frequencies antenna pairs
3.5.1 Pair-1 50MHz-100MHz and 100MHz-50MHz
3.5.2 Pair-2 50MHz-200MHz and 200MHz-50MHz
3.5.3 Pair-3 100MHz-200MHz and 200MHz-100MHz
3.6 Case Studies
3.7 Summary
Chapter 4 Frequency Band Adjustment based Matching Filters for GPR Data
Overview
4.1 Introduction
4.2 Data Acquisition Procedure
4.3 Theoretical Perspective
4.4 Filter fabrication Procedure
4.4.1 Constant Transmitting Frequency （CFT） FBA Match Filter
4.4.2 Similar Transmitting-Receiving Frequency （SFT） FBA Match Filter
4.4.3 Variable Transmitting Frequency （VFT） FBA Match Filter
4.5 Application results of the filters
4.5.1 CFT FBA Match Filter
4.5.2 SFT FBA Match Filter
4.5.3 VFT FBA Match Filter
Chapter 5 Conclusions and suggestions
Overview
References
Disseminations
Project Funding
Glossary
本文编号：3148646
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